Trifluoroacetic acid → HCID 11998203, compound

HRID 1259812Notes

Reaction equation

[CH2:1]([N:6]1[C:14]2[C:9](=[CH:10][CH:11]=[CH:12][CH:13]=2)[C:8]2([C:25]3[C:17](=[CH:18][C:19]4[O:20][CH2:21][O:22][C:23]=4[CH:24]=3)[C:16](=O)[CH2:15]2)[C:7]1=[O:27])[CH2:2][CH2:3][CH2:4][CH3:5].C([SiH](CC)CC)C.FC(F)(F)C(O)=O>>[CH2:1]([N:6]1[C:14]2[C:9](=[CH:10][CH:11]=[CH:12][CH:13]=2)[C:8]2([C:25]3[C:17](=[CH:18][C:19]4[O:20][CH2:21][O:22][C:23]=4[CH:24]=3)[CH2:16][CH2:15]2)[C:7]1=[O:27])[CH2:2][CH2:3][CH2:4][CH3:5]

Participants

Reactant 3

HCID 6422Trifluoroacetic acid

HCID 12052Triethylsilane

HCID 11998204HCID 11998204, compound

Product 1

HCID 11998203HCID 11998203, compoundYield 52%

Procedure

A mixture of 1′-pentylspiro[indeno[5,6-d][1,3]dioxole-5,3′-indole]-2′,7(1′H,6H)-dione (0.04 g, 0.11 mmol), triethylsilane (1.50 mL) and trifluoroacetic acid (2.00 mL, excess) was stirred at ambient temperature overnight. The mixture was concentrated in vacuo to dryness. The residue was subjected to flash column chromatography to afford the title compound (0.02 g, 47%) as an oil: 1H NMR (300 MHz, CDCl3) δ 7.25 (td, 1H), 7.06-6.95 (m, 2H), 6.88 (d, 1H), 6.77 (s, 1H), 6.05 (s, 1H), 5.88-5.82 (m, 2H), 3.81-3.60 (m, 2H), 3.37-3.24 (m, 1H), 3.13-3.01 (m, 1H), 2.70-2.59 (m, 1H), 2.44-2.32 (m, 1H), 1.76-1.64 (m, 2H), 1.39-1.28 (m, 4H), 0.88 (t, 3H); 13C NMR (75 MHz, CDCl3) δ 179.5, 147.9, 147.0, 142.9, 138.2, 136.7, 134.7, 128.1, 123.5, 122.6, 108.3, 105.3, 103.6, 101.2, 59.9, 40.0, 38.3, 31.6, 29.0, 27.1, 22.6, 14.0; MS (ES+) m/z 372.1 (M+23), 350.1 (M+1).

Workup

concentrationThe mixture was concentrated in vacuo to dryness

Sources & evidence

ORD record: ord-c3790c76aa3e4d30944bf1c9fdfcf0c9
Source dataset: uspto-grants-2013_06
DOI: 10.6084/m9.figshare.5104873.v1
Patent number: US08466188B2

Reaction notes

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